$1 \text{ kWh} = 3.6 \times 10^6 \text{ joules}$. Is this statement true or false?

Resistivity of two elements $A$ and $B$ are $1.62 \times 10^{-8} \, \Omega m$ and $520 \times 10^{-8} \, \Omega m$ respectively. Out of these two,name the element that can be used to make
$(i)$ filament of electric bulb.
$(ii)$ wires for electrical transmission lines. Justify your answer in each case.

Five bulbs are connected in a parallel circuit. If the second bulb blows out,what happens?

Resistance of a metal wire of length $1\, m$ is $26\, \Omega$ at $20^{\circ} C$. If the diameter of the wire is $0.3\, mm$,what will be the resistivity of the metal at that temperature?

What is the unit of electric potential difference?

$A$ bulb is rated at $5.0 \text{ V}, 100 \text{ mA}$. Calculate its
$(i)$ power and $(ii)$ resistance.